<template>
       <div>
            <router-link tag="div" to="/" class="header-abs" v-show="true">
                    <div class="iconfont back-icon">&#xe60a;</div>
            </router-link>
               <transition name="fade">
                    <div class="header-fixed" v-show="!showAbs">
                            <router-link to="/">
                                 <div class="iconfont header-back">&#xe60a;</div>
                            </router-link>
                            景点详情
                    </div>
               </transition>
       </div>
    </template>

<script>
    export default {
        name: 'DetailHeader',
        data() {
            return {
                showAbs: true
            }
        },
        methods: {
            handleScroll() {
                const top = document.documentElement.scrollTop;
                if (top > 60) {
                    this.showAbs = false;
                } else {
                    this.showAbs = true;
                }
            }
        },
        activated() {
            window.addEventListener('scroll', this.handleScroll)
        },
        deactivated() {
            window.removeEventListener('scroll', this.handleScroll);
        },
    }
</script>

<style lang="scss" scoped>
    @import '~@/assets/style/varibles.scss';
    .fade-enter,
    .fade-leave-to {
        opacity: 0;
    }
    
    .fade-enter-acrive,
    .fade-leave-active {
        transition: opacity 1s
    }
    
    .header-abs {
        position: absolute;
        left: .2rem;
        top: .2rem;
        width: .8rem;
        height: .8rem;
        line-height: .8rem;
        border-radius: .4rem;
        background-color: rgba(0, 0, 0, .8);
        text-align: center;
        .back-icon {
            color: #fff;
            font-size: .6rem;
        }
    }
    
    .header-fixed {
        z-index: 2;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: $headerHeight;
        line-height: $headerHeight;
        overflow: hidden;
        text-align: center;
        color: #fff;
        background: $bgColor;
        font-size: .32rem;
        .header-back {
            position: absolute;
            top: 0;
            left: 0;
            width: .64rem;
            text-align: center;
            font-size: .4rem;
            color: #fff;
        }
    }
</style>